光学补偿式连续变倍体视显微镜的光学设计

介绍了变倍范围在 1×～ 4×的连续变倍体视显微镜的光学系统设计。论述了该系统的变焦原理、高斯光学计算及变焦物镜的设计方法     

基于SLM显微立体视觉模型的3D微定位研究

基于体视显微镜(Stereolightmicroscope,SLM)的显微立体视觉已经在微操作领域应用。本文研究了基于SLM显微立体视觉模型的微操作系统中的三维微观定位问题。通过对SLM双光路的分析,给出了描述二维图像空间和三维物空间映射的弱非线性显微立体视觉模型。采用立体匹配算法和目标识别两种方式对运动图像序列中的目标对象进行捕捉,可以批量给出立体图像中相关点的坐标。利用显微立体视觉理论模型和显微图像处理实现了微操作系统中的微观3D定位。     

体视显微镜法测定糯高粱种皮厚度

本研究用固态和液态冷镶嵌料凝固高粱颗粒样品,经抛磨机研磨和抛光处理后,在体视显微镜下进行观察,利用电脑测量软件对我公司酱香型白酒生产所用的糯高粱种皮厚度进行了测量,并考察了其精密度和准确度。分析结果表明,相对标准偏差为2.62%~4.81%,能满足高粱种皮厚度分析的精密度和准确性要求。     

Microscopic observations of self‐healing products in calcareous fly ash mortars

The results of microstructural characterization of mortars containing fly ash class C (High Calcium Fly Ash) from combustion of lignite are presented. The evaluation of the microstructure was performed using scanning electron microscope, optical, and confocal microscope. The tested beams were bent till the crack and microcracks opening, which were healed during the different curing time. The results showed that the replacement of cement with fly ash class C influenced the process of crack healing. The addition of HCFA, at both 30% and 60%, speeds up the self‐healing process in cracks and particularly in micro‐cracks. In the research, the completely filling up of the cracks by new phases has not been observed, only the beginning of such process has been noticed. Microsc. Res. Tech., 78:22–29, 2015. © 2014 Wiley Periodicals, Inc.     

Effect of ultrasonic activation on dentinal tubule penetration of calcium silicate‐based cements

This study investigated the dentinal tubule penetration of mineral trioxide aggregate (MTA), NeoMTA Plus and Biodentine placed by either manual condensation or ultrasonic activation in simulated open apex model. Standardized divergent open apex models were created using palatal roots of 60 human maxillary molars and divided into six groups according to the used cements and activation methods (n = 10): MTA‐manual condensation, MTA‐ultrasonic activation, NeoMTA Plus‐manual condensation, NeoMTA Plus‐ultrasonic activation, Biodentine‐manual condensation, Biodentine‐ultrasonic activation. For the measurement of penetration, the cements were mixed with 0.1% Rhodamin B and 6‐mm apical portions of each root canal were obturated in an orthograde direction. The roots were embedded into acrylic blocks, and 1‐mm‐thick sections were obtained at 3 mm from the apex. Specimens were mounted onto glass slides and scanned under a confocal laser scanning microscope (CLSM) and stereomicroscope. Dentinal tubule penetration areas, depth and percentage were measured using LSM and ImageJ software. The data were analyzed using two‐way analysis of variance (anova ) with Bonferroni correction (α = 0.05). No correlation was found between stereomicroscope and CLSM analyses (p > .05). CLSM analysis showed no significant differences between MTA, NeoMTA Plus, and Biodentine groups when manual condensation was used (p > .05). Ultrasonic activation did not increase the tubular penetration of MTA, NeoMTA Plus or Biodentine as compared to manual condensation of each material (p > .05). MTA, NeoMTA Plus and Biodentine showed similar tubular penetration when manual condensation was used. Ultrasonic activation of these cements had no effect on tubular penetration of each material as compared to the manual condensation counterparts.     

体视显微镜像倾的计算机分析与校正

通过建立计算机三维模型,模拟Greenough(格雷诺)体视显微镜系统中像倾的产生,并得到校正方法。调整半五角棱镜两个方向的角度,可以校正像倾。像倾角的大小与体视角和半五角棱镜的出射角有关。特别地,在90°观察角的光学系统中,无像倾存在。